Infiniti QX4 (R50). Manual - part 520

SPD385A

Install friction plate guides.

Correctly align the raised portions of friction plates, and apply
grease to inner surfaces of friction plate guides to prevent
them from falling.

SPD386A

Install differential case B over side gear, discs, plates and fric-
tion plate guide assembly.

Install differential case B while supporting friction plate
guides with your middle finger inserted through oil hole in
differential case.

Be careful not to detach spring disc from the hexagonal
part of the side gear.

SPD426

Install pinion mate gears and pinion mate thrust washers on
pinion mate shaft, then install pinion mate shaft in differential
case B.

SPD387A

Install side gear to pinion mate gears.

Install each disc and plate.

Use same procedures as outlined in steps 1. through 4. above.

SPD388A

Install differential case A.

Position differential cases A and B by correctly aligning marks
stamped on cases.

REAR FINAL DRIVE

H233B

Limited Slip Differential (Cont’d)

PD-52

SPD364A

Tighten differential case couple bolts.

10. Place ring gear on differential case and tighten ring gear bolts.
Tighten bolts in a criss-cross pattern, lightly tapping bolt head
with a hammer.
Then bend up lock straps to lock the bolts in place.
11. Install side bearing inner cone.
12. Check differential torque.

Adjustment

NBPD0040

For quiet and reliable final drive operation, the following five adjust-
ments must be made correctly:
1.

Side bearing preload

Pinion gear height

Side bearing preload

Ring gear-to-pinion backlash. Refer to SDS, PD-62.

Ring and pinion gear tooth contact pattern

SPD196A

PINION GEAR HEIGHT

NBPD0040S01

Make sure all parts are clean and that the bearings are well
lubricated.

Assemble the pinion gear bearings into the pinion pre-load
shim selector tool, J34309.

SPD197A

Rear Pinion Bearing — the rear pinion bearing pilot,
J34309-8, is used to center the rear pinion bearing only. The
rear pinion bearing locking seat, J34309-4, is used to lock the
bearing to the assembly.

Front Pinion Bearing — make sure the J34309-3, front pin-
ion bearing seat is secured tightly against the J34309-2 gauge
anvil. Then turn the front pinion bearing pilot, J34309-5, to
secure the bearing in its proper position.

SPD216A

Place the pinion preload shim selector tool gauge screw
assembly, J34309-1, with the pinion rear bearing inner cone
installed, into the final drive housing.

IDX

REAR FINAL DRIVE

H233B

Limited Slip Differential (Cont’d)

PD-53

SPD217A

Install the J34309-2 gauge anvil with the front pinion bearing
into the final drive housing and assemble it to the J34309-1
gauge screw. Make sure that the J34309-16 gauge plate will
turn a full 360 degrees, and tighten the two sections by hand
to set bearing pre-load.

Turn the assembly several times to seat the bearings.

SPD234A

Measure the turning torque at the end of the J34309-2 gauge
anvil using torque wrench J25765A.

Turning torque specification:

0.4 - 0.9 N·m (4 - 9 kg-cm, 3.5 - 7.8 in-lb)

SPD208A

Place the J34309-12 “H233B” pinion height adapter onto the
gauge plate and tighten it by hand.

CAUTION:

Make sure all machined surfaces are clean.

SPD286A

PINION HEIGHT ADJUSTING WASHER SELECTION
8.

Position the J25269-18 side bearing discs and the arbor into
the side bearing bores.

SPD237A

Install the bearing caps and torque the bolts.

Specification:

93 - 103 N·m (9.5 - 10.5 kg-m, 69 - 76 ft-lb)

REAR FINAL DRIVE

H233B

Adjustment (Cont’d)

PD-54

SPD204A

10. Select the correct standard pinion height adjusting washer

thickness using a standard gauge of 2.5, 3.0, or 3.5 mm
(0.098, 0.118, or 0.138 in) and your J34309-101 feeler gauge.
Measure the distance between the J34309-12 “H233B” pinion
height adapter and the arbor.

SPD779

11. Write down your exact total measurement.

SPD542

12. Correct the pinion height washer size by referring to the “pin-

ion head height number”.

There are two numbers painted on the pinion gear. The first
one refers to the pinion and ring gear as a matched set and
should be the same as the number on the ring gear. The sec-
ond number is the “pinion head height number”, and it refers
to the ideal pinion height from standard for the quietest opera-
tion. Use the following chart to determine the correct pinion
height washer. Refer to SDS, PD-63.

Pinion Head Height Number

Add or Remove from the Selected

Standard Pinion Height Washer

Thickness Measurement

−6

Add 0.06 mm (0.0024 in)

−5

Add 0.05 mm (0.0020 in)

−4

Add 0.04 mm (0.0016 in)

−3

Add 0.03 mm (0.0012 in)

−2

Add 0.02 mm (0.0008 in)

−1

Add 0.01 mm (0.0004 in)

Use the selected washer thickness

Subtract 0.01 mm (0.0004 in)

Subtract 0.02 mm (0.0008 in)

Subtract 0.03 mm (0.0012 in)

Subtract 0.04 mm (0.0016 in)

Subtract 0.05 mm (0.0020 in)

Subtract 0.06 mm (0.0024 in)

IDX

REAR FINAL DRIVE

H233B

Adjustment (Cont’d)

PD-55

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